[jira] [Resolved] (IMPALA-13526) Inconsistent Agg node stats recomputation.

["Riza Suminto (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-13526?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Riza Suminto resolved IMPALA-13526.
-----------------------------------
    Fix Version/s: Impala 4.5.0
       Resolution: Fixed

> Inconsistent Agg node stats recomputation.
> ------------------------------------------
>
>                 Key: IMPALA-13526
>                 URL: https://issues.apache.org/jira/browse/IMPALA-13526
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Frontend
>    Affects Versions: Impala 4.4.0
>            Reporter: Riza Suminto
>            Assignee: Riza Suminto
>            Priority: Major
>             Fix For: Impala 4.5.0
>
>
> Within DistributedPlanner.java, there are several place where Planner need to insert extra merge aggregation node. It require transferring HAVING conjuncts from preaggregation node to merge aggregation, unsetting limit, and recompute stats of preaggregation node. However, the stats recompute is not consistently done, and there might be an inefficient recompute happening.
> Example of inefficient recomputes:
> https://github.com/apache/impala/blob/88e0e4e8baa97f7fded12230b14232dc85cf6d79/fe/src/main/java/org/apache/impala/planner/DistributedPlanner.java#L1074-L1077
> Example of missing recompute for phase2AggNode:
> https://github.com/apache/impala/blob/88e0e4e8baa97f7fded12230b14232dc85cf6d79/fe/src/main/java/org/apache/impala/planner/DistributedPlanner.java#L1143-L1168



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